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/*
* nanowasm, a tiny WebAssembly/Wasm interpreter
* Copyright (C) 2023-2025 Xavier Del Campo Romero
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
#include <nanowasm/nw.h>
#include <nw/io.h>
#include <nw/log.h>
#include <nw/routines.h>
static enum nw_state get_maximum(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_mem *const mem = &m->sm.memory;
struct nw_mod_out_mem *const lin = &m->out.linear;
struct nw_sm_leb128 *const l = &mem->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &lin->max, cfg->user);
if (n)
return n;
m->next = nwp_section_exit;
return NW_AGAIN;
}
static enum nw_state get_initial(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_mem *const mem = &m->sm.memory;
struct nw_mod_out_mem *const lin = &m->out.linear;
struct nw_sm_leb128 *const l = &mem->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &lin->initial, cfg->user);
if (n)
return n;
m->next = mem->flags ? get_maximum : nwp_section_exit;
return NW_AGAIN;
}
static enum nw_state get_flags(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_mem *const mem = &m->sm.memory;
struct nw_sm_leb128 *const l = &mem->leb128;
const enum nw_state n = nwp_varuint1(cfg, l, &mem->flags, cfg->user);
if (n)
return n;
m->next = get_initial;
return NW_AGAIN;
}
static enum nw_state get_count(struct nw_mod *const m)
{
const struct nw_io_cfg *const cfg = &m->cfg.io;
struct nw_sm_mem *const mem = &m->sm.memory;
struct nw_sm_leb128 *const l = &mem->leb128;
const enum nw_state n = nwp_varuint32(cfg, l, &mem->count, cfg->user);
if (n)
return n;
else if (mem->count > 1)
{
#ifdef NW_LOG
nwp_log("MVP WebAssembly supports no more than 1 memory\n");
#endif
return NW_FATAL;
}
m->next = mem->count ? get_flags : nwp_section_exit;
return NW_AGAIN;
}
void nwp_section_memory(struct nw_mod *const m)
{
const struct nw_sm_mem mem = {0};
m->next = get_count;
m->sm.memory = mem;
}
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